Have been intermittently experiencing a problem for several months where all I get is a single horizontal line across the center of the screen when powered on. If I tap on the side of the TV then problem generally corrects itself, but lately it's taking more than just a tap to correct. Set is well out of warranty. From reading comments on similar problems it sounds like it might be a simple loose solder joint and easy to fix, so before I open her up and start wiggling wires around (since I have no schematic to know where the vertical deflection circuit connection might be) can you make any suggestions? Thanks!

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